He

Shannon, Mark A, and Richard E Russo. "Monitoring stress power during high-power pulsed laser-material interactions." Applied Surface Science 96-98 (1996) 149–153.

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Mao, Xianglei, Wing-Tat Chan, Mark A Shannon, and Richard E Russo. "Plasma Shielding During Picosecond Laser Sampling of Solid Materials by Ablation in He Versus Ar Atmosphere." Journal of Applied Physics 74.8 (1993) 4915–4922.

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Mao, Xianglei, Oleg V Borisov, and Richard E Russo. "Enhancements in laser ablation inductively coupled plasma-atomic emission spectrometry based on laser properties and ambient environment." Spectrochimica Acta Part B-Atomic Spectroscopy 53 (1998) 731–739.

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Leung, Amy P. K, Wing-Tat Chan, Xianglei Mao, and Richard E Russo. "Influence of gas environment on picosecond laser ablation sampling efficiency and ICP conditions." Analytical Chemistry 70 (1998) 4709–4716.

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